Generate animation inside game play mode? (without sequencer)

I’d create some cars and make it move by a blueprint which uses a spline to control its path. The cars move perfectly in play in editor mode (the play button above the viewport) My final goal is to make an animation whilst camera is following a path and track the cars. For the car movement, all car are keep looping to driving over a bridge. I’d found that this might do it with sequencer and camera rig rail. However the car movement will also need to config in the sequencer by keyframe which I dont want to, because i’d already got a spline path to work. Is it possible to render a animation for my situation? Thanks.